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Shellder evolves using the Water Stone. There is no level that it specifically has to be on in order to evolve.
Shellder does not evolve by level. Use a water stone on it (bought from celadon department store) when you are ready to evolve it
You evolve shelder with a water stone.
It evolves with a water stone
Rhydon is not able to evolve in FireRed.
Electabuzz is not able to evolve in FireRed.
You evolve it at level 20
areodactl does not evolve:-)
Golduck does not evolve.
Rattata will evolve at level 20.
Ghastly will evolve at level 20.
pidgeotto will evolve at level 36